stone castle and magical egg

"Castel dell'Ovo" is also called "Castle of the Egg" is a fortified castle perched in the Bay of Naples and the oldest castle in Naples. It was important to both the Greeks and the Romans who occupied the land. The first structure, built in the 12th century, was renovated numerous times and remained a seat of power for many centuries. These days the castle contains the Museum of Prehistory and is also used for events and exhibitions.
The castle's name comes from a legend about the Roman poet Virgil, who had a reputation in medieval times as a great sorcerer. In the legend, Virgil put a magical egg into the foundations to support the fortifications. Had this egg been broken, the castle would have been destroyed and a series of disastrous events would have involved the city of Naples.